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Hello this is Dr. Salama MD,
This is known as gynecomastia. It happens when there is an imbalance of the estrogen to testosterone levels in the body. This is not dangerous.
However, taking testosterone and/or estrogen can be dangerous for other reasons such as causing blood clots, heart attacks and strokes.
I would have him discontinue them as as soon as possible to prevent any possible side effects.
Let me know if you have any other questions. If not, please don't forget to leave a positive rating as that's the only way I get credit for answering your question. Thank you.
With continued estrogen usage, large muscle groups such as the chest, legs and arms may begin to shrink and bones may become more porous and brittle, thereby contributing to weakness and bone fracture. In addition, fat storage may be increased, leading to a feminization of body shape.